My recent expensive purchase of a Gruen 17 ligne size p.w. movement, as reported last week, is not. I am convinced it is a resale by Gruen of an uncommon Assmann. So I bought an Assmann not a Gruen thus the active bidding for it by collecters smarter than me. Reasons: It is not a known Gruen product. Has no Gruen design features as in the 18s and 16s supplied exclusively to Gruen. Has no Gruen name on dial. Gruen name marking on movement added in black. Gold marking for Spaulding customer and other marking by Assman. The gold serial number by Assmann is not right age for the Gruen&Son added black marking. Has the traditional Assmann watch escapement not the poised pallet Gruen design.
18s movement shows traditional pallet as in little one.
So I do not have to worry about finding a gold Gruen case for it. And cost appropriate.